Cornus kousa Cultivar with Fused Bracts and Disease Resistance
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Solution Overview
Problem
Current dogwood tree cultivars lack resistance to powdery mildew and dogwood anthracnose, and do not exhibit the unique feature of fused bracts, which are desirable in ornamental horticulture.
Innovation Solution
The development of a new dogwood tree cultivar, 'Pam's Mountain Bouquet', which is resistant to powdery mildew and dogwood anthracnose and features fused bracts, achieved through asexual reproduction by rooting of terminal cuttings and grafting onto seedling rootstocks, showcasing stability in successive generations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dogwood tree cultivars are used, then they are easy to cultivate, but they lack resistance to powdery mildew and dogwood anthracnose
Solution Approach 1:
The patent applies parameter changes by selecting and propagating a specific cultivar ('Pam's Mountain Bouquet') that possesses altered genetic parameters conferring disease resistance. The cultivar was discovered through systematic evaluation of multiple seedlings, identifying one with superior resistance parameters to powdery mildew and dogwood anthracnose while maintaining cultivar stability through asexual reproduction
2Shape
If conventional dogwood tree cultivars are used, then they have typical bract structure, but they do not exhibit fused bracts which are desirable in ornamental horticulture
Solution Approach 1:
The patent applies local quality by focusing on a specific local characteristic (bract fusion) of the 'Pam's Mountain Bouquet' cultivar. Approximately 82% of bracts on this cultivar exhibit fusion, creating a distinctive ornamental feature that differentiates it from conventional cultivars with typical separate bract structure. This localized morphological variation enhances the overall ornamental value of the cultivar
3Reliability
If a new cultivar with fused bracts and disease resistance is developed, then ornamental value and durability are enhanced, but reproduction and stabilization of unique features require multiple generations of asexual reproduction
Solution Approach 1:
The patent applies preliminary action by performing multiple generations of asexual reproduction (rooting terminal cuttings and grafting axillary buds) before commercial propagation. This preliminary propagation process, conducted in Oak Ridge, Tenn., and at a nursery in Belvidere, Tenn., ensures that the unique features (fused bracts and disease resistance) are stabilized and true-to-type before wide dissemination of the cultivar
Data Source
AI summary
A new and distinct cultivar of flowering dogwood tree, which has fused bracts is provided. This dogwood tree is botanically known as Cornus kousa and referred to by the following cultivar name: ‘Pam's Mountain Bouquet’.